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Recognized MSVC++ workaround

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[SVN r12437]
This commit is contained in:
Vesa Karvonen
2002-01-22 13:33:39 +00:00
parent fa88c0d360
commit aeea661a59
1 changed files with 6 additions and 3 deletions
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9
include/boost/preprocessor/tuple/elem.hpp
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@ -17,8 +17,6 @@
<a href="../../../../boost/preprocessor/tuple/elem.hpp">Click here to see the header.</a>
*/
#include <boost/preprocessor/expand.hpp>
//! Expands to the I:th element of an N-tuple.
/*!
For example,
@ -48,8 +46,13 @@ See BOOST_PP_LIMIT_TUPLE.
// This is a workaround for a CodeWarrior PP bug. Strictly speaking
// this workaround invokes undefined behavior, but it works as desired.
# define BOOST_PP_TUPLE_ELEM_DELAY(N,I,T) BOOST_PP_TUPLE##N##_ELEM##I##T
#else
#elif !defined(BOOST_NO_COMPILER_CONFIG) && defined(_MSC_VER)
# include <boost/preprocessor/expand.hpp>
// This is a workaround for a MSVC++ PP bug. It should not be necessary
// to use BOOST_PP_EXPAND(). Works on standard conforming compilers, too.
# define BOOST_PP_TUPLE_ELEM_DELAY(N,I,T) BOOST_PP_EXPAND(BOOST_PP_TUPLE##N##_ELEM##I T)
#else
# define BOOST_PP_TUPLE_ELEM_DELAY(N,I,T) BOOST_PP_TUPLE##N##_ELEM##I T
#endif
// NOTE: TUPLE_ELEM can be implemented in O(N*N) space and O(N) time instead